I have always been error prone when it comes to executions. In my trading I make frequent adjustments to my stops, targets, etc. as market conditions change and tws is a bit difficult to do this on, as you probably know. Booktrader is an improvement but it is not user friendly imo, so I lhave been using a frontend for quite some time. I am now using Buttontrader and am extremely pleased with its performance. For me it is the simplest of them all to do what I do. Not saying it is the best for everyone, but for me it is. I have not made one error since I began using it and so it is paying for itself many times over. It has not malfunctioned a single time and I cannot say that about the others I have used.